Jetevator for missile control



Oct. 12, 1965 L- c. FISHER JETEVATOR FOR MISSILE CONTROL 2 Sheets-Sheet 2 Filed Sept. 23, 1959 FIG.2.

F IG.4.

INVENTOR. LYMAN C. FISHER ATTORNEYJ United States Patent 3,210,935 JETEVATOR FOR MISSILE CONTROL Lyman C. Fisher, Silver Spring, Md., assignor to the United States of America as represented by the Secretary of the Navy Filed Sept. 23, 1959, Ser. No. 841,901 1 Claim. (Cl. 60-3554) (Granted under Title 35, U.S. Code (1952), sec. 266) The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

This invention relates to a device for deflecting the exhaust of a reaction motor; more specifically it relates to a jetevator which will not bind due to the deposition of propellant residue thereon.

When an annular jetevator which closely fits a reaction motor nozzle is moved so that its lip enters the exhausting gas stream to deflect the same and produce side thrust needed in missile control, the gas stream separates from the wall of the nozzle at a point upstream from the jet evator lip, and a shock wave forms at the separation point. Consequently, the exhaust gas in the region around the deflecting jetevator lip has a relatively low velocity and a relatively high pressure compared to the stream flow. This low velocity high pressure area is relatively stagnant and provides excellent conditions for the build-up of deposits on the lip which causes the jetevator to bind in the described position.

The problem of residue build-up is especially acute with the high energy propellants now in use which contain metals. Such metals are oxidized to their high-melting oxides during the combustion process and form coatings on cooler portions of the nozzle and jetevator.

It is therefore an object of this invention to provide a jetevator of the aforesaid type which will not permit the formation of appreciable exhaust gas deposits thereon.

Another object is to provide such a jetevator which Will not bind during operation of the reaction motor to which it is attached.

Other objects and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:

FIG. 1 is a cross-sectional elevation view of a reaction motor nozzle with a jetevator attached and canted so as to deflect the exhaust gas;

FIG. 2 is a cross-sectional elevational view of a reaction motor nozzle with a jetevator showing one species of the present invention;

FIG. 3 is a cross-sectional elevational view of a jetevator showing another species of the invention;

FIG. 4 is a cross-sectional elevational view of a jetevator showing still another species of the invention; and

FIGS. 5 and 6 are cross-sectional elevational views showing the configuration of the apertures shown in FIG. 4.

Referring now to the drawings in which like reference numerals indicate like parts throughout the several views, there is shown in FIG. 1 a nozzle 11 having a flange near the entrance which has a plurality of apertures for bolting the nozzle to the reaction motor and having a portion of 3,210,935 Patented Oct. 12, 1965 "ice its external surface near the discharge end shaped like a section of a sphere. Jetevator 12 is annular and the rear portion is shaped internally like a section of a sphere and is attached to the discharge end of the nozzle 11 by diametrically disposed pins 13 so as to form a modified ball and socket joint. The forward portion of jetevator 12 is shaped generally cylindrical internally. Control arms 14 and 15 are diametrically disposed and project outwardly from the jetevator. Rods 16 and 17 are pivotally attached to control arms 14 and 15 respectively at 18 and 19. Rods 16 and 17 are attached to control means, not shown, for moving the jetevator pivotally about pins 13 so that the gas issuing from the nozzle is deflected.

There is shown in FIG. 2 the nozzle 11 with jetevator 12 attached thereto by means of pins 13. Each portion of the lip of the jetevator which juts into the gas stream is provided with a plurality of equidistantly spaced openend slots, the spacing within each portion being symmetrical with respect to the axis of pins 13.

FIG. 3 shows a jetevator having a plurality of closed slots histead of open slots;

FIG. 4 shows a jetevator having a plurality of apertures instead of slots;

FIG. 5 shows a cylindrical cross-sectional configuration of the aperture; and

FIG. 6 shows the apertures to be contour nozzles.

In the older type device as shown in FIG. 1, the canting of the jetevator to the position shown causes the gas stream to separate from the nozzle wall and form a shock wave as shown. The result is a region of relatively stagnant gas around the deflecting jetevator lip.

In the instant device, openings are provided in the jetevator lip so that the gas which would otherwise stagnate can escape to a lower pressure area outside the jetevator and carry the deposit-forming substances along with it.

While the embodiments shown are directed to a swivel type jetevator, capable of only rotational movement about pins 13, the teachings contained herein are equally applicable to jetevators capable of true ball and socket movement. The apertures in that event would be positioned completely about the lip of the jetevator.

The apertures in the lip of the jetevator may have a variety of configurations, and may be tapered from inside to outside, their main function being to allow the relatively stagnant gas to escape.

From the foregoing, it will be appreciated that the formation of deposits on the jetevator lip is kept to a minimum, which in turn keeps binding of the jetevator to a minimum.

Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claim the invention may be practiced otherwise than as specifically described.

What is claimed as new and desired to be secured by Letters Patent of the United States is:

An annular jetevator adapted internally to fit about the end portion of a rocket nozzle which has an external section of spherical shape so as to form a ball-and-socket joint with said jetevator, said jetevator being further adapted to be attached to the sphere-shaped portion of the nozzle so as to move pivotally with respect thereto, in

such a manner to cause two diametrically disposed portions of the jetevator lip to jut into and to deflect the exhaust flow from the nozzle when attached and so moved, the jetevator further having two sets of apertures, one set being disposed substantially in one portion of the jetevator lip which juts into the exhaust flow from the nozzle when the jetevator is pivotally attached to the nozzle and moved in one direction, and the other set being substantially disposed in the other portion of the jetevator lip which juts into the exhaust flow when the jetevator is pivotally attached to the nozzle and moved in the opposite direction, one set of apertures being symmetrical to the other set of apertures with respect to a plane which passes through the longitudinal axis of said jetevator and through the axis of pivotal movement of said jetevator.

MARK NEWMAN,

Maynard 60-3554 Kuhring 6039.65 Fiedler 6035.55 Towle et a1. 6035.54 Parker 6035.54

David 6035.5 5

Primary Examiner.

ARTHUR M. HORTON, SAMUEL FEINBERG,

Examiners. 

